John,

I just scanned the manual and it appears that you cannot assign just the mic to an output channel. However, a good workaround would be to use a small mixer with effects, then output the mixer to the Bose L1 Compact's mic input channel, which would provide you with a separate volume and EQ control. Or, if you need harmony, use a TC Helicon Harmony-M, which provides you with a great sound reverb, vocal harmony, and other neat effects. Fire the Harmony-M's output into the Bose L1 Compact Mic input and you've got the best of both both worlds.

Hope this helps,

Gary